Abstract
A new difunctional monomer N,N'-[bis(4,4'-hydroxypropyl methacrylate phenyl ester) pyromellitimide] (BHPMEPM), was synthesized by the reaction of the bis(4-carboxyphenyl)-N,N'-pyromelli- timide acid (diacid-diimide), and two molar equivalents of glycidylmethacrylate (GMA). The reaction was carried out by microwave radiation. The presence of difunctional groups, double bond groups, makes the monomer a potential material for obtaining thermosetting product. The curing and thermal stability of the crosslinked products were studied by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA) techniques. The difunctional monomer and its thermoset polymer were characterized by FT-IR, 1H-FT-NMR and CHN elemental analysis.
Highlights
Due to their unique combination of properties like good dielectric strength and dimensional stability, Polyamides (PIs) as thermostats resins are constantly attract a wide interest [1]-[4]
Monomer Synthesis Diacid-diimide was synthesized from condensation reaction of aquimolar of pyromellitic dianhydride (PMD) with two aquimolar of p-amino benzoic acid (p-ABA) in a mixture of glacial acetic acid and pyridine using microwave irradiation
The chemical structure of the bifunctional monomer BHPMEPM was confirmed by FT-IR, 1HNMR spectroscopy and elemental analysis
Summary
Due to their unique combination of properties like good dielectric strength and dimensional stability, Polyamides (PIs) as thermostats resins are constantly attract a wide interest [1]-[4] As they are mainly used in the aerospace and electronic industries in the forms of films and moldings. Saedi thermal decomposition and the reason behind that is their chain rigidity and strong interaction To overcome this and increase processability, structural modification is done to increase the solubility in solvents or to decrease the melting temperatures. To obtain polyesters there are two techniques which usually used first: interfacial polymerization reaction between dicarboxyliccid chlorides and diols; second: acid or phenyl ester exchange reaction of acetate or ester of the acids under critical conditions such as high temperature and reduced pressure. All organic solvents were analytical grade products and were used as received or purified by distillation before use
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